I personally don't see a huge difference between the B6 and the B12 in terms of hp. Now in terms of torque and acceleration, yes, big difference. That comes with displacement of the B12 being a bigger motor. Now when it comes between the crotch rockets, that is a different story. I would be determined to help a newer rider to stray away from the liter bikes. The power difference and capabilities between a 600 and a 1000cc sport bikes is about 60 hp and 20 to 40 ft lbs of torque. On top of that, the weight differences are not that much different as well. I never felt that the B12 to be hard to keep the front down. But on a bike like the GSXR1000, you have to work at it to keep the front end down. In my opinion, if a person is a previously experienced rider, they should be able to restrain themselves from going throttle crazy. If that is the case, then it isn't irresponsible for someone to recommend a B12. In the case of this individual, I would recommend something like the B6. This is because he plans on passing it down to a new rider. This is a case where he can kill two birds with one stone by going with a smaller bike and get reacquainted. He can then pass it on to an inexperienced rider.